岩土工程学报Issue(1)：91-97,7.DOI:10.11779/CJGE201501010
不同制样方法非饱和土的持水特性研究
Water retention behaviour of soils with different preparations
摘要
Abstract
A series of water retention tests and mercury intrusion porosimetry tests on a clay are performed to investigate the influence of different specimen preparations on water retention behaviour and its pore-size distribution as well as the influence of different isotropic stresses on water retention behaviour. The experimental results show that pre-consolidated specimens exhibit a unimodal pore-size distribution, and unsaturated compacted specimens usually have a double-porosity microstructure, while its microstructure can change due to saturation at the applied pressures of 20 kPa. Under the same initial void ratio and isotropic stress, the pore sizes of pre-consolidated specimens exhibit a uniform distribution, so they have higher air-entry value than the compacted specimens. Under the same initial void ratio of pre-consolidated specimens, the air-entry value increases with the increasing isotropic stress. Finally, based on the results of the mercury intrusion porosimetry tests, a method for predicting the water retention curve of pre-consolidated and compacted specimens during drying is proposed, and the predicted results are compared with the measured values.关键词
非饱和土/预固结样/持水曲线/压汞试验/压实样Key words
unsaturated soil/pre-consolidated specimen/water retention curve/mercury intrusion porosimetry/compacted specimen分类
建筑与水利引用本文复制引用
孙德安,高游..不同制样方法非饱和土的持水特性研究[J].岩土工程学报,2015,(1):91-97,7.基金项目
国家自然科学基金项目（11272194）；上海市自然科学基金项目 （）
